Upcoming Walks: October 2018 – February 2019

MASTER SCHEDULE:
Variances only  announced by Loys Maingon

Questions:  tsolumresearch@gmail.com

CVN Walks October 2018 -February 2019 .PDF
CVN WALKS:  October 2018 to February 2019
All walks minimum 2 hrs
PARTICIPANTS SHOULD MEET EITHER AT CARPOOLING LOCATION OR AT TRAILHEADS
Carpooling at either Old Downtown Courtenay Thrifty’s or Country Market north of Courtenay
Day, date and Month Carpooling place and time Destination Difficulty
Sunday October 7 Thrifty’s  8:30am Nile Creek (PUBLIC) easy hike
Sunday October 14 Country Market  8:30am Elk River Trail easy hike
Saturday October 20 Country Market  8:30am Ripple Rock easy hike
Sunday October 28 Coal hills Special EVENT  VIRM (October 27 and 28)
Sunday November 4 Trailhead Nymph Falls (PUBLIC) level walk
Sunday November 11 Thrifty’s  8:30am Comox Lake Reserve hike
Saturday November 17 Thrifty’s  8:30am Ships Point / Mud Bay level walk
Sunday November 25 Trailhead (Bates Rd) Seal Bay Park Marine side stair walk
Sunday  December 2 Country Market  8:30am Pub to Pub/Oyster River level walk
Sunday December 9 Trailhead (Tsolum River Road) Tsolum Spirit Park level walk
Saturday December 15 Trailhead Kye Bay Beach level with cobbles
BREAK
Sunday January 6 Country Market  8:30am Pub to Pub/Oyster River (PUBLIC) level walk
Sunday January 13 Trailhead (Powerhouse Rd.) Puntledge  Park/ Ruth Masters Level walk
Saturday January 19 Trailhead DND Entrance.) Goose Spit level with cobbles
Sunday January 27 Condensory Bridge Condensory Bridge to Air Park level walk
Sunday February 3 Trailhead (Bates Rd.) Seal Bay, Melda’s Marsh level walk
Participants are expected to wear good hiking shooes and rainproofs and to assume their own safety.
Walks are for CVN members. Only walks Marked “PUBLIC” are open to the general public.

 

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Shoreline Outing Summary: Cape Lazo, Intertidal Food Webs, September 20th, 2018

Hey Everyone,
Just before the weather turned ugly, we made is out to the shoreline below the cliffs at Cape Lazo. We were trying to make sense of some of the feeding relationships along the shoreline. As we get more experience and exposure, we’ll be able to figure out more of these complex intertidal food webs, where everything seems to eat everything. I’ll break down the experience into (1) Observations (2) Follow-up points and (3) Links for further consideration.

(1) Observations
We noted the primary producers in various states of life and decay. Living seaweeds, algal crusts and phytoplankton (seen under the microscope in water samples taken from Cape Lazo) are the photosynthetic organisms that pull carbon (and nitrogen, phosphorous et al.) out of the water to create the organic matter that ultimately fuel the rest of the ecosystem. Their productivity is governed by nutrient availability, sunlight and how clear the water is- low light penetration is a limiting factor, particularly for the seaweeds.
We saw a number of organisms who feed directly on the seaweeds and algae– small limpets (Lottia sp.), snails (periwinkles– Littorina sp.) and shore crabs (Hemigrapsus sp.). We looked at the modified legs of the shorecrab, whose diet consists mostly of diatoms, green algae (eg. Ulva) and red algae. A potpourri of indiscriminate filter feeders/suspension feeders (mussels, oysters, bryozoans, sponges) consume the phytoplankton, zooplankton (including larvae) and detritus that happens to go there way as water is passes through.
Higher up the shoreline, we saw a melange of decaying/fermenting seaweeds. There are organisms that feed quite specifically on this decaying layer. We say Sand fleas and an indeterminate annelid worm. These organisms are in turn fed on by other invertebrates (eg. the fast moving wolf-spiders common on the shoreline) as well as larger birds. Many of you have seen the gulls poking at the sand above the high-tide line. They are foraging for sand fleas, among others.
Further down the shore, we saw swathes of small acorn barnacles completely shattered and removed from their rocky substrate. After some speculation, we noted a star-shaped pattern to this activity matching the shape of the purple sea star. This unsuspecting predator pulls apart the plates and valves of its prey and then inserts its stomach to digest the contents held within. By this means, it preys on barnacles, mussels, snails, chitons, limpets and even urchins. While we didn’t witness it on Thursday, we did trade horror stories about watching large gulls consume whole sea stars.
We saw a variety of other feeding relationships– the circular borings of the molluscan radula into shells- likely the work of a gastropod. We tried to figure out what some of the gulls, harlequin ducks, cormorants and scoters were eating, as all were numerous. Unclear for now.
(2) Follow up points
We tried three methods for observing feeding relationships
-direct observation (works well for small creatures who don’t feed exposed)
-spotting interactions with binoculars then visiting the scene of the crime (will work with birds with a little patience)
-fecal analysis. The scat, frass, pellets and plops of the intertidal can usually be matched to the organism that left them. Some organisms (herons, crabs, minks, otters) leave very clear records of their diet in their scat. Others (gulls), not so much.
A fourth means is to actually take a live or recently dead sample and look at the gut contents. This may be ethically uncomfortable for some.
(3) Links for Further Consideration
Shirley brought a hard copy of Kozloff’s Marine Invertebrates of the Pacific Northwest. This is the most comprehensive key to shoreline (and all other marine) life in our region. The paperback version can be had for about $50, but the keys themselves are all available online, courtesy of Dave Cowles.
FEEDING RELATIONSHIPS: Shoreline Group Member David I. passed along a link to a very comprehensive, evidence-based site from Thomas Carefoot, an emeritus professor of biology from UBC. A Snail’s Odyssey looks at the major invertebrate groups of the shoreline and breaks down their feeding, reproduction, predators, physiology, locomotion and more based on study data that he has been curating for decades. Most of the data and syntheses are very local.
Another email incoming about our next outing.
See you soon,
Randal
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Jensen Keltie, CVN Bursary Recipient, 2018

Jensen Keltie is a graduating grade 12 student from Vanier Secondary School.
The Bursary Committee chose Jensen for her outstanding academic achievement, her active participation in conservation and environmental issues and her contribution to the Vancouver Island University’s Deep Bay Marine Field Station in Bowser as a summer student and volunteer for several years. Her involvement at the station in various research projects on marine organisms and aquatic animal husbandry encouraged her to pursue a Bachelor of Science program with a focus on marine biology at Dalhousie University in Halifax this fall. As a marine biologist, Jensen’s goal is to participate in projects that promote awareness and conservation of marine life and support environmental stewardship. We wish Jensen much success in her studies and future endeavours! Congratulations!

 

 

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Upcoming Walk: Sunday, 29th July 2018, Hike to Aston Pond

SUN. July 29, 8:30am: Hike to Aston Pond (near Panther Lake)

A long day hike (14 km round trip)  with biologist Loys Maingon on subalpine pond ecology. Pack a lunch. Meet at Parking area on Strathcona Parkway just off Highway 19 at 8.30 am to carpool -a vehicle with good clearance necessary for logging road access. Sturdy footwear is essential – be prepared for sudden changes in the weather in the mountains. Always carry water. No dogs, please. Participants should always check the SWI website for  any changes in scheduling or trail conditions, 24 hours before the scheduled hikes. (http://strathconapark.org). For more information and to pre-register email: strathconawilderness@gmail.com. Note : due to uncertainties as to the condition of the trail, participants should carry equipment for an overnight stay.

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